6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
13 Advanced Configuration and Power Interface (ACPI) support for
14 Linux requires an ACPI-compliant platform (hardware/firmware),
15 and assumes the presence of OS-directed configuration and power
16 management (OSPM) software. This option will enlarge your
19 Linux ACPI provides a robust functional replacement for several
20 legacy configuration and power management interfaces, including
21 the Plug-and-Play BIOS specification (PnP BIOS), the
22 MultiProcessor Specification (MPS), and the Advanced Power
23 Management (APM) specification. If both ACPI and APM support
24 are configured, ACPI is used.
26 The project home page for the Linux ACPI subsystem is here:
27 <https://01.org/linux-acpi>
29 Linux support for ACPI is based on Intel Corporation's ACPI
30 Component Architecture (ACPI CA). For more information on the
34 ACPI is an open industry specification originally co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
36 it is developed by the ACPI Specification Working Group (ASWG) under
37 the UEFI Forum and any UEFI member can join the ASWG and contribute
38 to the ACPI specification.
39 The specification is available at:
40 <http://www.acpi.info>
41 <http://www.uefi.org/acpi/specs>
45 config ACPI_LEGACY_TABLES_LOOKUP
48 config ARCH_MIGHT_HAVE_ACPI_PDC
53 depends on SUSPEND || HIBERNATION
56 config ACPI_PROCFS_POWER
57 bool "Deprecated power /proc/acpi directories"
60 For backwards compatibility, this option allows
61 deprecated power /proc/acpi/ directories to exist, even when
62 they have been replaced by functions in /sys.
63 The deprecated directories (and their replacements) include:
64 /proc/acpi/battery/* (/sys/class/power_supply/*)
65 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
66 This option has no effect on /proc/acpi/ directories
67 and functions, which do not yet exist in /sys
68 This option, together with the proc directories, will be
69 deleted in the future.
71 Say N to delete power /proc/acpi/ directories that have moved to /sys/
73 config ACPI_EC_DEBUGFS
74 tristate "EC read/write access through /sys/kernel/debug/ec"
77 Say N to disable Embedded Controller /sys/kernel/debug interface
79 Be aware that using this interface can confuse your Embedded
80 Controller in a way that a normal reboot is not enough. You then
81 have to power off your system, and remove the laptop battery for
83 An Embedded Controller typically is available on laptops and reads
84 sensor values like battery state and temperature.
85 The kernel accesses the EC through ACPI parsed code provided by BIOS
86 tables. This option allows to access the EC directly without ACPI
88 Thus this option is a debug option that helps to write ACPI drivers
89 and can be used to identify ACPI code or EC firmware bugs.
97 This driver supports the AC Adapter object, which indicates
98 whether a system is on AC or not. If you have a system that can
99 switch between A/C and battery, say Y.
101 To compile this driver as a module, choose M here:
102 the module will be called ac.
110 This driver adds support for battery information through
111 /proc/acpi/battery. If you have a mobile system with a battery,
114 To compile this driver as a module, choose M here:
115 the module will be called battery.
122 This driver handles events on the power, sleep, and lid buttons.
123 A daemon reads events from input devices or via netlink and
124 performs user-defined actions such as shutting down the system.
125 This is necessary for software-controlled poweroff.
127 To compile this driver as a module, choose M here:
128 the module will be called button.
132 depends on X86 && BACKLIGHT_CLASS_DEVICE
136 This driver implements the ACPI Extensions For Display Adapters
137 for integrated graphics devices on motherboard, as specified in
138 ACPI 2.0 Specification, Appendix B. This supports basic operations
139 such as defining the video POST device, retrieving EDID information,
140 and setting up a video output.
142 To compile this driver as a module, choose M here:
143 the module will be called video.
150 This driver supports ACPI fan devices, allowing user-mode
151 applications to perform basic fan control (on, off, status).
153 To compile this driver as a module, choose M here:
154 the module will be called fan.
159 This driver supports ACPI-controlled docking stations and removable
160 drive bays such as the IBM Ultrabay and the Dell Module Bay.
162 config ACPI_PROCESSOR
168 This driver installs ACPI as the idle handler for Linux and uses
169 ACPI C2 and C3 processor states to save power on systems that
170 support it. It is required by several flavors of cpufreq
171 performance-state drivers.
173 To compile this driver as a module, choose M here:
174 the module will be called processor.
181 This driver enables the ACPI to access the BMC controller. And it
182 uses the IPMI request/response message to communicate with BMC
183 controller, which can be found on on the server.
185 To compile this driver as a module, choose M here:
186 the module will be called as acpi_ipmi.
188 config ACPI_HOTPLUG_CPU
190 depends on ACPI_PROCESSOR && HOTPLUG_CPU
191 select ACPI_CONTAINER
194 config ACPI_PROCESSOR_AGGREGATOR
195 tristate "Processor Aggregator"
196 depends on ACPI_PROCESSOR
199 ACPI 4.0 defines processor Aggregator, which enables OS to perform
200 specific processor configuration and control that applies to all
201 processors in the platform. Currently only logical processor idling
202 is defined, which is to reduce power consumption. This driver
203 supports the new device.
206 tristate "Thermal Zone"
207 depends on ACPI_PROCESSOR
211 This driver supports ACPI thermal zones. Most mobile and
212 some desktop systems support ACPI thermal zones. It is HIGHLY
213 recommended that this option be enabled, as your processor(s)
214 may be damaged without it.
216 To compile this driver as a module, choose M here:
217 the module will be called thermal.
222 depends on (X86 || IA64)
223 default y if IA64_GENERIC || IA64_SGI_SN2
225 config ACPI_CUSTOM_DSDT_FILE
226 string "Custom DSDT Table file to include"
228 depends on !STANDALONE
230 This option supports a custom DSDT by linking it into the kernel.
231 See Documentation/acpi/dsdt-override.txt
233 Enter the full path name to the file which includes the AmlCode
236 If unsure, don't enter a file name.
238 config ACPI_CUSTOM_DSDT
240 default ACPI_CUSTOM_DSDT_FILE != ""
242 config ACPI_INITRD_TABLE_OVERRIDE
243 bool "ACPI tables override via initrd"
244 depends on BLK_DEV_INITRD && X86
247 This option provides functionality to override arbitrary ACPI tables
248 via initrd. No functional change if no ACPI tables are passed via
249 initrd, therefore it's safe to say Y.
250 See Documentation/acpi/initrd_table_override.txt for details
253 bool "Debug Statements"
256 The ACPI subsystem can produce debug output. Saying Y enables this
257 output and increases the kernel size by around 50K.
259 Use the acpi.debug_layer and acpi.debug_level kernel command-line
260 parameters documented in Documentation/acpi/debug.txt and
261 Documentation/kernel-parameters.txt to control the type and
262 amount of debug output.
265 bool "PCI slot detection driver"
269 This driver creates entries in /sys/bus/pci/slots/ for all PCI
270 slots in the system. This can help correlate PCI bus addresses,
271 i.e., segment/bus/device/function tuples, with physical slots in
272 the system. If you are unsure, say N.
275 bool "Power Management Timer Support" if EXPERT
279 The Power Management Timer is available on all ACPI-capable,
280 in most cases even if ACPI is unusable or blacklisted.
282 This timing source is not affected by power management features
283 like aggressive processor idling, throttling, frequency and/or
284 voltage scaling, unlike the commonly used Time Stamp Counter
287 You should nearly always say Y here because many modern
288 systems require this timer.
290 config ACPI_CONTAINER
291 bool "Container and Module Devices"
292 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
294 This driver supports ACPI Container and Module devices (IDs
295 ACPI0004, PNP0A05, and PNP0A06).
297 This helps support hotplug of nodes, CPUs, and memory.
299 To compile this driver as a module, choose M here:
300 the module will be called container.
302 config ACPI_HOTPLUG_MEMORY
303 bool "Memory Hotplug"
304 depends on MEMORY_HOTPLUG
306 This driver supports ACPI memory hotplug. The driver
307 fields notifications on ACPI memory devices (PNP0C80),
308 which represent memory ranges that may be onlined or
309 offlined during runtime.
311 If your hardware and firmware do not support adding or
312 removing memory devices at runtime, you need not enable
315 To compile this driver as a module, choose M here:
316 the module will be called acpi_memhotplug.
319 tristate "Smart Battery System"
323 This driver supports the Smart Battery System, another
324 type of access to battery information, found on some laptops.
326 To compile this driver as a module, choose M here:
327 the modules will be called sbs and sbshc.
330 tristate "Hardware Error Device"
332 This driver supports the Hardware Error Device (PNP0C33),
333 which is used to report some hardware errors notified via
334 SCI, mainly the corrected errors.
336 config ACPI_CUSTOM_METHOD
337 tristate "Allow ACPI methods to be inserted/replaced at run time"
341 This debug facility allows ACPI AML methods to be inserted and/or
342 replaced without rebooting the system. For details refer to:
343 Documentation/acpi/method-customizing.txt.
345 NOTE: This option is security sensitive, because it allows arbitrary
346 kernel memory to be written to by root (uid=0) users, allowing them
347 to bypass certain security measures (e.g. if root is not allowed to
348 load additional kernel modules after boot, this feature may be used
349 to override that restriction).
352 bool "Boottime Graphics Resource Table support"
353 depends on EFI && X86
355 This driver adds support for exposing the ACPI Boottime Graphics
356 Resource Table, which allows the operating system to obtain
357 data from the firmware boot splash. It will appear under
358 /sys/firmware/acpi/bgrt/ .
360 config ACPI_REDUCED_HARDWARE_ONLY
361 bool "Hardware-reduced ACPI support only" if EXPERT
365 This config item changes the way the ACPI code is built. When this
366 option is selected, the kernel will use a specialized version of
367 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
368 resulting kernel will be smaller but it will also be restricted to
369 running in ACPI reduced hardware mode ONLY.
371 If you are unsure what to do, do not enable this option.
373 source "drivers/acpi/apei/Kconfig"
376 tristate "Extended Error Log support"
377 depends on X86_MCE && X86_LOCAL_APIC
382 Certain usages such as Predictive Failure Analysis (PFA) require
383 more information about the error than what can be described in
384 processor machine check banks. Most server processors log
385 additional information about the error in processor uncore
386 registers. Since the addresses and layout of these registers vary
387 widely from one processor to another, system software cannot
388 readily make use of them. To complicate matters further, some of
389 the additional error information cannot be constructed without
390 detailed knowledge about platform topology.
392 Enhanced MCA Logging allows firmware to provide additional error
393 information to system software, synchronous with MCE or CMCI. This
394 driver adds support for that functionality with corresponding
395 tracepoint which carries that information to userspace.